Mechanisms of False Counting in Monitoring Plutonium Contaminations

Yukimasa IKEBE; Takao IIDA; Michikuni SHIMO; Akio SEKI; Kei NAKATA; Mamoru YOSHIDA

doi:10.5453/jhps.17.157

Yukimasa IKEBE, Takao IIDA, Michikuni SHIMO, Akio SEKI, Kei NAKATA, Mamoru YOSHIDA

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Keywords: false counting, plutonium, plutonium contamination, plutonium monitoring, radon, radon concentration, radon daughters, electrification, alpha-survey, hand foot clothes monitor, air monitoring

JOURNAL FREE ACCESS

1982 Volume 17 Issue 2 Pages 157-164

DOI https://doi.org/10.5453/jhps.17.157

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Abstract

In plutonium facilities, false countings have been experienced frequently in monitoring plutonium contaminations on clothes, gloves, vinyl sheets and arches of shoes. Electric fields, alpha contaminations and Rn concentrations were measured in the rooms of the facilities, and the conditions and the mechanisms of the false countings were studied through the measurements. It was found that the false countings are caused by the negative electrification of the surface of the objects and/or high Rn concentrations in the room air due to inflow of underground air.

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